Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual torneio Silva se associou com Nicole Thijssen contra as oponentes na final Nina Bratchikova & Frederica Piedade?
 ###Tabelas: CREATE TABLE third_round_proper (third_round_proper_id AUTO_INCREMENT PRIMARY KEY, Tie no VARCHAR, Home team VARCHAR, Score VARCHAR, Away team VARCHAR, Date VARCHAR) CREATE TABLE doubles_18 (doubles_18_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponent in the final VARCHAR, Score VARCHAR) CREATE TABLE goalkeeping_leaders (goalkeeping_leaders_id AUTO_INCREMENT PRIMARY KEY, No. INT, Player VARCHAR, Club VARCHAR, Games Played INT, Minutes INT, Goals Against INT, GA Average VARCHAR, Wins INT, Loses INT) CREATE TABLE season_3:_2004 (season_3:_2004_id AUTO_INCREMENT PRIMARY KEY, No. in Series INT, No. in Season INT, Title VARCHAR, Directed by VARCHAR, Written by VARCHAR, U.S. viewers (millions) VARCHAR, Original air date VARCHAR) CREATE TABLE race_winners (race_winners_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Driver/s VARCHAR, Class VARCHAR, Vehicle VARCHAR, Race title VARCHAR)  
SELECT Tournament FROM doubles_18 WHERE Partner = nicole thijssen AND Opponent in the final = nina bratchikova & frederica piedade